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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '26f76ae65671d1139afe3ccbc8be5c5f4ee44e4bec09ea92ee3b18360174a890' 
  AND token = 'Tjxna3AJnXH7qTzYCECHyKs8AOPz+P1Y+8TnkxP/qA0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}